I hope everyone likes a big picture But this is the worst of 4 wheels. This chunk of gunk

I think I would do the following:

1. Spray the Sonax and let it pool at the bottom in as large an area as you can.
2. After letting it sit for twice as long as the recommended time (I think the recommended is like 3-5 minutes), agitate it with a toothbrush
3. Let it sit again for a few minutes and agitate it again
4. Rinse
5. Turn the wheel so you can get another area where the Sonax can pool and sit and repeat 1-4